Drill point grinder



Sept 30, 1952 J. BECKER 2,612,012

DRILL POINT GRINDER Filed Oct. 13, 1950 2 SHEETS-*SHEET- 1 Sept. 30,1952 J. BECKER 2,612,012

'DRILL POINT GRINDER F-le'd oct. 13, 195o a'sI-IEETs-SHEET z Patented Sept. 30, 1952 UNITED STATES PATENT `2,612,012 n DRILL POINT GRINDER John Becker, Irvington, N. J. v

' Application october 13,195o,seria1N0.1s9,919

tice the invention, the following detailed description taken in connection with the accompanying drawings in which like numbers representlike parts throughoutand which form ja. part hereof, being intended for the purpose of illustration.

In the drawings:

Fig. 1 is a top plan view of my novel device shown in relationto a grinding wheel;

Fig. 2 is an end elevational view of the device of Fig. 1, taken from the end at the bottom of Fig; l as shown:

Fig. 3 is a section taken along the line 3-3 of Fig. 2,;

Fig. 4 is alsection taken alongthe line 4--4 of Fig. 1;

Fig. 5 is a longitudinal section, taken along the line 5-5 of Fig. l; and

Fig. 6 is an enlarged detailed view, partly in section, showing the plunger resting on the edges of the flutes of a drill while the latter is in the drill channel.

Referring to the drawings, a grinding wheel I0 is shown mounted on a shaft I I in conventional manner with other associated parts. My novel device is carried ron a suitable base I2 on which is mounted a cross slide I3, also in conventional manner. Above the slide I3 and keyed to it at right angles thereto is a carriage 55 which in the conventional manner permits the parts carried by it to be moved back and forth with relation to the wheel I0 by means of the usual lathe-type structrure, including the ball crank I4 and screw I5.

Rectilinear movement of the cross slide I3 and associated parts along the base I2 from side to side is permitted by moving lever I6 in the direction of the arrows I 1 shown in Fig. 1. Lever I6 is pivoted as at I8 and is joined to the carriage 55 by means of link I 9 movably mounted on lever I6 and the carriage 55.

Integrally joined to the'carriage 55 at each end are upright supports 29 having inwardly tapering set screws 2| located on the inner faces of the supports 20 near the tops thereof. Suspended between the points of set screws 2l is swivel (frame) 22 comprising base 23 and supporting arms 24 having conventional bearing surfaces.

. yThe base 23has an arcuate groove 25 which is i 11 Claims. (Cl.A` 521-219) vso located as to beequidistant throughout its length from a predetermined point 26 on .the wheel I0. The groove 25 has afshouldered recess 21 on either side and along the'length thereof. Movably fitted intdthe shouldered recess 21 is a column 2B- provided on its bottom with aguide threaded bolt 29 adapted to move in slot 25 when column 28 is moved along the shouldered recess 21 and to,'hold column 28 and base 23 together in any desired position. l v

- Attached to the top of column 28 -is a bearing y 3 0 lshown in the drawings as being attached to the column by means of screws 3|. The bearing 30 has a circular guide opening-32' therethrough for receiving the shaft 33 of the adjusting means comprising thumb wheel 34, shaft 33, collar 35 and threaded stem 36. The anchoredadjusting means just describedvengages with adjusting nut 31,` whereby lturning of the thumb wheel 34 in one direction causes nut 31 and its associated parts to move upwards, while turning of the thumb wheel 34 in the opposite direction causes the downward 'movement of nut 31 and its associated parts.

Rider nut 31 is rigidly attached to the drill receptacle 38 by suitable means so that the receptacle 38 moves up and down with the rider nut 31. The receptacle 38 has a V-channel 39 along which the drill 40 to be' ground rests. Longitudinally movable along the receptacle 38 is plunger guide 4I which is'keyed yas at 42 to the receptacle 3B and which can be rmly attached vto the receptacle by suitable means,` including -a'thumb screw 43, as shown in Fig. 4. 'n

vertically movable Within plunger guiderlil isa vplunger 44 having'a tapered conical face 45 so angled as to rest uponY conventional drill `'flute edges 46. The plunger 44 isjoined to heel shaft 41 by movable plunger link 48. 'The heel shaft 41 is movable vertically within theopening 49r in fplunger guide 4I and has a heel 50 which rests -on the drill 40. In operation, pressuremay be applied downward on link 48 to keep the drill 40 Hfrom moving during the rgrinding operation.

`,To prevent back slipping of the drillv40 a drill stop 5I is provided along the bar 52 which is rigidly connected to the drill receptacle 3 8.van may be considered an extension thereof.

In operation, 'my device is brought to the correct position'as regards distance in front ofthe grinding wheel I0 by suitable adjustment of the ball crank I4. IThe correct lateral position isqbtained by moving the lever1I6 inthe. direction of the arrows I1, causing the carriage 55 and associated parts carrying the device of my invention to bemoved laterally. A i f The foregoing adjustments are conducted with the drill 40 in place in the V-channel 39 as shown in Fig. 5. Any desired lifting or lowering of the drill for more or less drill lip clearance is accomplished simply by turning thumb screw 34.

As will be understood by those skilled in the art of drill point grinding, it is necessary to impart a curved surface to each drill face. This is accomplished in accordance with my invention by swiveling and lowering the bar 52, as shown by the bar arrows 53 in Fig. 2.

After one face of a drill has been ground the swivel 22 is moved to the right by lever I6 to turn the drill so that the other face can lie-ground to correspond with the rst simply by lifting the plunger link 48 and turning the drill 40 around 'so as to cause the plunger face 45 to contact the other drill ute edges 4B. For example, in Fig. 6, the bottom flutes shown will be the ones to .be contacted by the plunger face 45 when the second drill face is to be ground. I Y

While I have described my invention in detail in it's preferred embodiment, it will be obvious to those skilled in the art, after understanding my invention, that various changes and modifications may be made therein without departing from the spirit or scope thereof. IY aim in the appended claims to cover all such modifications and changes. Further, I have not deemed it necessary to specify size of parts, nature of the material from which the parts are made and other details as suchV matters are within the'knowledge of those skilled in the art and form no part of the inventive ideas herein embodied and claimed.

I claim:

l. In a device for grinding the faces of a fluted drillon a 'grinding wheel having a circumferening a screw-actuated vertical slider rigidly united to said drill-holding means, and means for horizontally-adjusting the yposition of said plunger and plunger-related `member, said latter horizontally-adjusting means comprising a guide memb'er for receiving said plunger and plunger-related member in parallel vertical alignment and being slidably-movable along said drilleholding means to any desired fixed position.

2, Ina device for grinding the faces of a fluted drill on va grinding wheel having a circumferential `face drill-holdingmelans, the improvement which Acomprises a vertically-rotatable frame having'a base, an arcua'te'ly-dis'posed slot in the base, a

shouldered recess in the base around said slot and another base for drill-holding means, said latter base having a bottom conformingto the size and conguration'of and horizontally-movable withing means can'be arcuately adjusted so that'the drill point is fixed with regard to a predetermined point on lthe circumferential face of the grinding wheel.

3. In a device for grinding the faces of a fluted drill on a grinding wheel having a circumferential face drill-holding means. the improvement Cil in said shouldered recess, whereby the drill-hold- I which comprises a vertically-rotatable frame having a base, an arcuately-disposed slot in the base a shouldered recess in the base around said slot and another base for drill-holding means, said latter base having a bottom conforming to the size and configuration of and horizontallymovable within said shouldered recess, a downwardly-extending bolt carried by the base for the drill-holding means extending below the bottom surface of the shouldered recess, whereby the drill-holding means can be arcuately adjusted so that the drill point is fixed with regard to a predetermined point on the circumferential face of the grinding wheel.

4. In a device for grinding the faces of a fluted drill on a grinding Wheel having a circumferential face, the improvement which comprises drillholding means including a vertically-movable plunger having a downwardly-tapering lower end adapted to engage drill finte edges and to keep the drill in vnon-rotary position relative to the drill holding ymeans during the grinding operation, a vertically-rotatable frame having a base, an 'arcuately-disposed slot in the base, a shouldered recess in the base around said slot and another base for drill-holding means, said latter base having a bottom conforming to the size and configuration of and horizontally-movable within said'shoulde'red recess, whereby 'the drill-holding means can be arcuately adjusted so that the drill point is xed with regard to a predetermined point on the circumferential face of the grinding wheel.

5. In a device for grinding the'faces of a iiuted drill on a grinding wheelhaving a circumferential face, the improvement which comprisesdrillholding 'means including a vertically-movable pln'nger'having a downwardly-tapering lowerend adapted to engage drill flute edges and 'to keep the drill in non-rotary position relative to the drill holding means during the grinding operation, a vertically-rotatable frame having 'a base, an arcuately-disposed slot in the base, a shouldered recess in the base around said 's'lot and another base for drill-holding means, said latter base having a bottom conforming to the size and configuration of and horizontally-movable within said shouldered recess, a downwardly-extending bolt carried by the base for the drill-holding means extending below the bottom 'surface of the'sho'uldered recess, whereby the drill-holding means can be arcuately adjusted so that the drillfpoint is Afixed with regard toa predetermined point on the-circumferential face of the grinding wheel.

6. In a device for g'rinding'th'e'faces of a `ilnted Vdrill on a grinding wheel having a circumferentialface, the improvement which comprises drillholding lmeans including va vertically-movable plunger having a downwardly-tapering conical lower end-adapted toeng'a'ge vdrill flute edges, and a vertically-movable plunger-related 'member linked with said plunger and resting on the drill during the grinding operation whereby said plunger and vertically-movable member keep' the drill in non-rotary position-relative to the drillholding means during the grinding operation, a vertically-rotatable frame having aba-se, anarlcuately-disposed Aslot in jthe base, a'shouldered recess in the basearound-said slot an'd'ahother base for drill-holding 4meansI said latter base having a bottom conforming to the sizefand configuration of and horizontally-movable within said shouldered recess, whereby the drill-holding means can be arcuately adjusted so that the drill 5, point is fixed with regard to a predetermined point on the circumferential face of the grindin`g'- wheel. l

7; In a device for grinding the faces of a fluted drill on a grinding wheel having a circumferential face, the improvement-Whichcomprises drillholding means including a vertically-movable plunger having a downwardly-tapering conical lower end adapted to engage drill flute edges, anda vertically-movable plunger-related member linkedV with said plunger and 'resting on the drill during the grinding operation whereby said plunger and vertically-movable member keep the drill in non-rotary position relative to the drillholding means during the grinding operation, a vertically-rotatable frame having a base, an arcuately-disposed bolt in the base, a shouldered recess in the base around said slot and another base for drill-holding means, said latter base having a bottom conforming to the size and configuration of and horizontally-movable within said shouldered recess, a downwardly-extending bolt carried by the base for the drill-holding means extending below the bottom surface of the shouldered recess, whereby the drill-holding means can be arcuately adjusted so that the drill point is fixed with regard to a predetermined point on the circumferential'face of the grinding wheel.

8. In a device for grinding the faces of a fluted drill on a grinding wheel having a circumferential face, the improvement which comprises drillholding means including a vertically-movable plunger having a downwardly-tapering conical lower end adapted to engage drill iiute edges, and a vertically-movable plunger-related member linked with said plunger and resting on the drill during the grinding operation whereby said plunger and vertically-movable member keep the drill in non-rotary position relative to the drillholding means during the grinding operation, means for vertically-adjusting said drill-holding means, said vertically-adjustingv means comprising a screw-actuated vertical slider rigidly united to said drill-holding means, and means for horizontally-adjusting the position of said plunger and plunger-related member, said latter horizontally-adjusting means comprising a guide member for receiving said plunger and plunger-related member in parallel vertical alignment and being slidably-movable along said drill-holding means to any desired fixed position, and slotted guide means operatively associated with said drillholding means for arcuately adjusting said drillholding means so that the drill point is fixed with regard to a predetermined point on the circumferential face of a grinding wheel.

9. In a device for grinding the faces of a uted drill on a, grinding wheel having a circumferential face, the improvement which comprises drillholding means including a vertically-movable plunger having a downwardly-tapering` conical lower end adapted to engage drill flute edges, and a vertically-movable plunger-related member linked with said plunger and resting on the drill during the grinding operation whereby said plunger and vertically-movable member keep the drill in non-rotary position relative to the drillholding means during the grinding operation, means for vertically-adjusting said drill-holding means, said vertically-adjusting means comprising a screw-actuated vertical slider rigidly united to said drill-holding means, and means for horizontally-adjusting the position of said plunger and plunger-related member, said latter horizontally-adjusting means .comprising a guide member for receiving said plunger `and plunger-l related member in parallel 'ver' tica1 alignment and being slidably-movable along said drill-holding means to any desired iixed position, a vertically-rotatable frame having va base, anarcuately-disposed .slot in the base,: a shouldered recess in the base around said slot andlanother base forvdrill-holding means, said latter-base having a bottom conforming to-'the sizezand -configuration of and horizontally-movablewithin said shouldered recess, whereby the drill-holding means can be arcuately adjusted so that the drill point is xed with regard to a predetermined point on the circumferentiaI face of the grinding wheel.

10. In a device for grinding the faces of a uted drill on a grinding Wheel having a circumferential face, the improvement which comprises drill-holding means including a vertically-movable plunger having a downwardly-tapering conical lower end adapted to engage drill ute edges, and a vertically-movable plunger-related member linked with said plunger and resting on the drill during the grinding operation whereby said plunger and vertically-movable member keep the drill in non-rotary position relative to the drillholding means during the grinding operation,

means for vertically-adjusting said drill-holding means, said vertically-adjusting means comprising a screw-actuated vertical slider rigidly united to said drill-holding means, and means for horizontally-adjusting the position of said plunger and plunger-related member, said latter horizontally-adjusting means comprising. a guide member for receiving said plunger and plungerrelated member in parallel vertical alignmentv and being slidably-movable along said drill-holding means to any desired fixed position, a vertically-rotatable frame having a base, an arcuately-disposed slot in the base, a shouldered recess in the base around said slot and another base for drill-holding means, said latter base having a bottom conforming to the size and configuration of and horizontally-movable within said shouldered recess, a downwardly-extending bolt carried by the base for the drill-holding means extending below the bottom vsurface of the shouldered recess, whereby the drill-holding means can be arcuately adjusted so that the drill point is fixed with regard to a predetermined pclilint on the circumferential face of the grinding w eel.

11. In a device for grinding the faces of a uted drill on a grinding wheel having a circumferential face, the combination whichv comprises a base, a sliding member adapted to move transversely of said base, means for moving the device longitudinally of the base, supporting members carried by said longitudinally-movable means, a frame, including a base pivotally mounted between said supporting members for rotary movement vertically, a curved guide slot in said base located so as to be equidistant throughout its length from a predetermined point; on the circumferential surface of the grinding wheel, drillholding means having a portion adapted to be moved within said slot, said drill-holding means including a plunger having a conical lower end adapted to engage the drill iiutes and to keep the drill in non-rotary position relative to the drillholding means during the grinding operation. JOHN BECKER.

(References on following page) REFERENCESV CITED Number Name Date` Renecker 1 1 Jan.' 4, 1887 'Agesen v Mar. v23, 1897 Reimann Jan. 5, 1904 Crowther Dec. :20, 191() Va-uclain 1 v Man-19., 1912 Weishampel 11.1- Nov. 9, 1937 Number 2,313,641 2,369,642 2,37 1,676

Number 8 Name Date Hoerst Mar. 9, 1943 Benning Feb. 20, 1-945 Coyne Mar. 20, 1945 Munro May 31, 1949 Bowman Jan. 1, 1952 FOREIGN PA"1`1 11\I'IS Country Date K Germany Apr. 8, 1922 France Feb, 23, 1923 Great IBritain Mar. 7, 1945 

